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Reports utility classes that can be converted to enums.
<p>Some coding style guidelines require implementing utility classes as enums
  to avoid code coverage issues in <code>private</code> constructors.</p>
<p><b>Example:</b></p>
<pre><code>
  class StringUtils {
    public static final String EMPTY = "";
  }
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
  enum StringUtils {
    ;
    public static final String EMPTY = "";
  }
</code></pre>
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